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Data are usually referred to as raw data ¹ or crude data ¹ prior to their processing and tabulation and basic data ¹ or primary data ¹ after processing and tabulation. Basic data usually consist of series ² of absolute numbers ³ which are put together in the form of statistical tables ⁴ . In such tables the data are generally classified with respect to certain variables ⁵ or variates ⁵ such as age, number of children, etc., or with respect to certain attributes ⁶ or characteristics ⁶ (i.e. sex, marital status, etc.). Where data are classified with respect to several variables or attributes simultaneously the tables are called cross-tabulations ⁷ or contingency tables ⁷ . Summary tables ⁸ give information in less detail than do individual tables ⁹ .

• 1. When the data relate to individuals (110-2) as their unit of analysis they may be referred to as micro-data. Aggregate data or macro-data relate to a unit of analysis other than an individual, for example, a nation or an administrative unit within a nation. Micro-data can be derived from several sources such as a field survey (203-5) or a sample of vital registration records. A new source of micro-data is the census public use sample, which is a systematic or a random sample of census returns that is made available for analytical purposes to interested individuals.
• 7. A table which presents the distribution of a single variable or attribute within a population is generally called a frequency table.

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